package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 功能：
 * 作者：zhoujun
 * 日期： 2024/12/29 16:39
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURL = request.getRequestURI();


        String [] urls = new String[] {
                "/employee/login",
                "/emplouee/logout",
                "/backend/**",
                "/front/**"
        };
        log.info("拦截到请求：{}", requestURL);
        boolean check = check(urls, requestURL);
        if (check) {
            log.info("本次请求{}不需要处理", requestURL);
            filterChain.doFilter(request, response);
            return;
        }
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户ID为： {}", request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));
        log.info("拦截到请求：{}", request.getRequestURL());
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match == true) {
                return true;
            }
        }
        return false;
    }

}